Scaffold.



No 826,041. PATENTED JULY 17, 1906. B. LONG & I. V. BRYANT.

SGAFFOLD.

APBLIUATION FILED AUG. 4. 1905.

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No. 826,041. PATENTED JULY 17, 1906. B; LONG 6: I. V. BRYANT.

SOAPFOLD.

APPLICATION FILED AUGA. 1905.

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UNITED STATES PATENT OFFICE.

SCAFFOLD.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed August 4, 1905. Serial No. 272,679.

To all whom it may concern:

Be it known that we, BARTLEY LONG and ISAAC VINToN BRYANT, citizens ofthe United States, residing at Bidwell, in the county of Gallia, Stateof Ohio, have invented certain new and useful Improvements in Scaifolds;and we do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to scaffolds, and more particularly to thosedesigned for use in building, painting,papering, &c., and has for itsobject to provide a scaffold of this kind which will be adjustable tosuit different conditions, which will include a vertically-movableplatform, and which will include means for moving the platform.

Other objects and advantages will be apparent from the followingspecification, which describes an embodiment of the present invention.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a side elevation of the present scafiold. Fig. 2 is a topplan view with the supplemental platform in position. Fig. 3 is a rearelevation showing the winding drum. .Fig. 4 is a section on line 4 4 ofFig. 2, taken lon itudinally of the main platform and forwardly of thesupporting-falls. Fig.

5 is a section taken on line 5 5 of Fig. 2 at right angles to Fig. 4 andshowing one of the platform-latches in elevation. Fig. 6 is a bottomplan view of the platform, showing the guides and supplementalplatform-supports.

Referring now to the drawings, the present invention comprises asupporting-frame including front and rear sills 5 and 6, respectively,which are mounted upon bolsters 7 and 8, the latter being secured to afixed axle 9 and the former being pivoted to a steeringaxle 10, bothbeing rovided with wheels 11, and the steering-ax e has shafts 12secured thereto. The remaining ortions of the scaffold are carried bythe si ls 5 and 6, and it is thus apparent that the scaffold may bemoved sidewise over the ground. Adjacent to the ends the sills 5 and 6have vertical sockets 13, which receive the lower reduced ends 14 ofcorner-uprights, the sill 5 carrying the front uprights 1.5 and the sill6 carrying the rear uprights 15. These uprights each include a pluralityof detachably-connected sections 16, so that the sections may be removedor replaced to vary the length of the uprights. The uppermost sections16 are provided with upwardly-extending fingers 17, which are engaged inopenings 18, formed in top braces 19, one of these braces thusconnecting the forward and the other the rearward uprights. Forwardlyand rearwardly extending horizontal connecting-braces 20 are providedand have openings 21 therein which receive the fingers 17, and thesebraces 20 thus each connect one of the rearward with one of the forwarduprights.

Secured to the braces 19 there is a crossbar 22, which extends parallelto the braces '20, and outwardly beyond the braces 19 and at its frontand rear ends the cross-bar 22 carries a double pulley 23 and a singlepulley 24, respectively. A second cross-bar 25 is secured upon the bar22 and upon the crossbraces 20, the latter resting upon the braces 19,as shown, and this cross-bar 25 has a plurality of pulleys securedthereto, aswill be later described.

A platform 26 is provided, and it is disposed between the forward andrearward pairs of uprights, this platform projecting beyond the sides ofthe frame, and this platform is connected with the cross-braces 20 attheir centers by means of block and fall mechanisms 27, the cables 28 ofwhich are engaged in pulleys 29, which depend from the rearward topbraces 19 and descend therebeyond to a winding-drum 28, mounted inbrackets 29, which are secured to the rearward uprights 15, adjacent tothe lower ends thereof.

Secured beneath the platform 26 there are laterally-spaced forwardly andrearwardly extending pairs of cross-beams 30, the beams of each pairbeing spaced laterally and extending at their ends at opposite sides ofthe adjacent uprights 15 and 15, the cross-beams having rollers 31journaled therebetween inwardly of the uprights and resting against thelatter, and it will thus be seen that the ends of these cross-beams formguides for the reception of the uprights to prevent longitudinaldisplacement of the platform, the rollers steadying the platform duringits movement.

Secured to the forward faces of the forward uprights 15 and to therearward faces of the rearward uprights 15 there are verticallyextendingratchet-plates 32, having their teeth 33 directed inwardly with theirflat surfaces uppermost. A pair of latching devices are provided and areconnected with the platform 26, these latches bein arranged forengagement of the ratchetlates to hold the latform a ainst downwardmovement. The atches eac include a pivot-rod 35, and these pivot-rodsare disposed beneath the plat form 26 transversely thereof and atopposite sides of the center of the platform, the pivotrods beingconnected with the platform, as shown. A pair of end members 36 aresecured to the ends of the pivot-rod of each latch, extending downwardlytherebeyond and upwardly above the platform, and these end members havea latch-bar 37 secured to their lower ends, the end members 36 beingmovable pivotally with the pivot-rods to bring the latch-bars into andout of engagement with the teeth 33 of the ratchet-plates 32. Above theplatform 26 the end mem bers 36 are connected by rods 38, as shown.

The platform 26 is provided with a central verticalopening 39, in whichthere is engaged an oppositely-notched stemv 40, the notches beingarranged to form downwardly-directed ratchet-teeth 41. This stem isconnected at its upper end with the cross-bars 25 by means of a blockand fall 42, the cable 43 thereof hanging loose for manual operation ofthe latch mechanism. Beneath the platform 26 the stem 40 has ahorizontally-extending head 43, secured thereto, and pivotally connected with the sides of this head there are members 44, which extenddownwardly and outwardly and which are connected pivotally at theirlower ends with the latch-bars 37. It will be seen that the arrangementis thus such that when the stem 40 is moved downwardly the latch-b are37 are moved outwardly and into engagement with the teeth 33 of theratchet-plates 32 to hold the platform against downward movement andthat when the stem 40 is moved upwardly the latch-bars will be moved outof engagement with the ratchet-teeth. Pins 45, which are carried by thehead 43 and which act as pivot-pins for the members 44, lie between theend members 36 of the two latches 34, thus limiting the movement ofthese latches toward each other and preventing the latches moving intosuch position that downward movement of the stem would bring themtogether instead of separating them. It will thus be seen that when thewinding-drum 28 is revolved the platform will be raised, the stem 40having been moved to bring the latchbars 37 out of operative position.The latchbars will move into engagement with the ratchet-plate when thecable 43 is released. Dogs 46 are pivoted to the platform 26 and aremovable to lie in engagement with the ratchet-teeth 41 to hold the stem40, with the latches, in inoperative position, as will be readilyunderstood. The latch-plates 32 are formed of a plurality of sections topermit of lengthening or shortening the uprights 15, as mentioned above.

Secured to the under surface of the platform 26, adjacent to the endsthereof, there are guides 47, which receive slidably-supporting arms 48,which, as shown in Fig. 2, extend forwardly beyondthe frame and havedisposed thereupon a supplemental platform '49, the later being providedwith guides 50 therebeneath, which receive the arms 48, and a cable 51,which is engaged in the pulley 24, is connected with this supplementalplatform by means of a double pulley 23, secured thereto and with whichthe cable is engaged, it being also engaged in the ulley 23 to form adouble block and fall, as shown, to support it, and is also secured tothe winding-drum.

It will be apparent that the arms 48 may be engaged in the guides 47 toextend rearwardly beyond the frame and that the supplemental platform 49may be disposed at the rearward side of the frame as desired. Rollers 50are carried by the outer edge of the supplemental platform and rest aainst the wall adjacent to which the scaffold 1s disposed. A pluralityof pulleys 51 are carried by the cross-bar 25 and have cables engagedtherewith, which may be used in raising supplies to the platforms,certain of these cables passing through openings 26 in the plat form 26,and, as shown, pivoted closures 51 are provided for these openings. Aladder 52 is disposed at the rearward side of the frame and gives accessto the platform. An adjustable support 53 is provided and may bedisposed beneath the supplemental platform 49 to support it.

What is claimed is 1. Ascaffold comprising a frame, verticallyextendingratchets carried by the frame, a platform disposed in the frame forvertical movement, means for moving the platform.

vertically, guides for the platform, latches carried by the platform andarranged for cooperation with the ratchets to hold the platform atdifferent points of its downward movement, said latches comprising endmembers pivotally connected with the plat form and extending verticallytherebeyond in both directions, latch-bars carried by the lower ends ofthe end members, a stem slidably engaged in the platform and havingnotches therein, members pivotally connected with the stem and with thelatches for movement of the latch-bars into engagement with the ratchetswhen the stem is moved slidably in one direction, and dogs pivoted tothe platform and arranged for movement into engagement with the notchesof the stem to hold said stem against movement to bring the latches intooperative position.

2. A scaffold comprising a wheeled frame, said frame includingcorner-uprights and connecting top braces, cross-bars mounted upon thetop braces, a platform disposed in the frame for vertical movement, awindingdrum mounted in the frame, block-and-fall connections between thewinding-drum and the platform for movement of the latter, a supplementalplatform carried by the firstnamed platform, block-and-fall connectionsbetween the supplemental platform and the winding-drum, pulleys carriedby the other cross-bar and lying above the first-named platform,hoisting-ropes engaged in the pulleys, and means for holding thefirst-named platform at different points of its vertical movement.

3. The combination with a scafiold including a frame and a platformdisposed in the frame for vertical movement, of guides carried by theplatform therebeneath at its ends, arms removably engaged in the guidesand extending laterally beyond the frame in one direction, a cross-barcarried by the frame at its top, a supplemental platform having guidestherebeneath in which the outwardlyeXtending portions of the arms areremovably engaged, pulleys carried by the crossbar, a Winding-drum,cables connected with the winding-drum and with the first-named platformand arranged to raise the latter when the drum is revolved to wind thecables thereupon, a rope engaged in the pulleys and secured at one endto the supplemental platform and at its other end to the Windingdrum,and an adjustable support for the supplemental platform.

In testimony whereof we affix our signatures in presence of twowitnesses.

BARTLEY LONG. ISAAC VINTON BRYANT. Witnesses: I

EDITH BRYANT, SARAH BELL BRYANT.

